package demo2;

/**
 * @ClassDescription:
 * @JdkVersion: 1.8
 * @Author: 李白
 * @Created: 2024/4/24 22:45
 */
public class Computer {
    public void powerOn(){
        System.out.println("打开电脑");
    }
    public void powerOff(){
        System.out.println("关闭电脑");
    }
    public void useService(USB usb){
        usb.openDevice();
        if (usb instanceof Mouse){
            Mouse mouse = (Mouse) usb;
            mouse.click();
        }else if (usb instanceof KeyBoard){
            KeyBoard keyBoard = (KeyBoard) usb;
            keyBoard.input();
        }
        usb.closeDevice();
    }
}
